Gas governor



J. F'. SIMPSON ET AL GAS GOVERNOR aart J @EN FINDLATEB, SIMPSON, 0F SCUNTHORPE, ENGLAND, AN D WILL CA je., CL PEEBLES, 0F EDINBURGH, SCOTLAND.

GAS GOVERNOR.

Application filed December 1, 1924, Serial No. 753,340, and in Great Britain December a, 1923.

This invention relates to gas governing devices for maintaining, as far aspossible, constant pressure at the points of use under varying demand conditions.

A device according to the invention comprises an automatic or station governor with means for increasing the delivery' pressure with increased demand, and a differential governor in series with the automatic governor and contrived to set up a constant differential pressure across the valve of the automatic governor and thus prevent pressure changes from aiiecting the discharge per unit area of valve opening through the automatic governor. A,

The figure of the accompanying drawing is a sectional side elevation of a device according to the invention.

As shown, the bell or controlling element A of the automatic governor sustains the spindle B carrying the valve beats C, D which control the iiow of gas through the valve apertures E, F in the gas conduit. To isolate the bell from the pressure zone around the valve beats, a small inner bell G is arranged around the spindle B.

From the spindle B there extends upwards a rack H meshing with a quadrant P pvoted at L and fixed to a lever K that carries 'a curved track J upon which is adapted to .run a trolley M carrying a set of weights N by addition or removal of one or more of which the pressure of operation may be readily adjust-ed. It ,will be seen that, as the bell A falls or rises, the rack H partially rotates the quadrant P whereby the lever K is rocked and the track J tilted so that the trolley M travels in one direction or the other along the track and the moment of the weight N about the pivot L is increased or decreased, such moment being applied as a load to the bell A through the medium of the quadrant P and 'rack H.

The bell A and valve C, D are dpartly counterpoised by a weight suspende by a chain V from a quadrant lever T pivoted at S and fixed to a second quadrant R engaging the rack H.

The space within the bell A is connected with the conduit M1 for gas at outlet pressure by a valve Y1.

It is understood that, the interior of the bell A being connected to the conduit b the pipe V1, with increase in the deman the pipe V1in which is interposed aC bell A falls so that the valve C, D is opened further. With the descent of the rack H the trolley M moves along the curved track J and the moment of the weight N acting on the bell is increased as aforesaid. o Thus, the pressure increases as the valve C, D descends until a state of balance is reached between the upward and downward efforts on the bell A.

The differential governor disposed in series with. the automatic governor comprises a bell Q,1 movable within a sealed casing Pf and sustaining a valve K1 anterior to the valve C, D and of the same area as the `under side of the bell Q1. The interior of the bell Q1 is in communication with the conduit on the inlet side of the valve K1. The space within the interior of the casinw P1 communicates by way of a pipe S1 (fitte/d withl a valve T1) with a point of the conduit on the delivery side of the automatic 'governor valve C, D.

.As the upward lift of the bell Q,1and the downward pressure on the valve K1 neutralize one another, changes in the inlet pressure are without eiiect on the bell Q1 or. valve K1.

As the weight of the valve K1 ,and bell Q1 are only partly balanced, the tendency vof the valve'K1 is to open; in other words, the differential governor is loaded to balance the differential ressure. o

As the pressure beyon the automatic governor valve C, D increases, increased pressure acting on the upper surface of the bell Q1 tends to depress the bellQ1 and open the valve K1, allowing more gas to pass.

As, however, the pressure beyond the valve K1 builds up, it reacts on the underside v of the valve K1 and brings about a stabilization of pressure which continues as long as the demand remains constant.

In the claims the term bell is to ybe understood as covering any equivalent there'- for. A

What we claim is l. Ina gas governing device, in combination with a gas conduit, an automatic governor including a valve interposed in said conduit, a controlling element connected to said valve, a curved track horizontally 'pivoted between its ends, a weight movable on said track, operative connections between said track and said controlling element whereby said track is tilted and said weight moved to increase or decrease`the load on said controlling element as said valve moves further from or nearer to its closed position, and a controllable connection from a point of said conduit beyond said valve to the under side of said controlling element, and a differential governor in series with said automatic governor and comprising a second valve within said conduit anterior to said first mentioned valve, a bell connected to said second valve and open on its under side to a point of said conduit anterior to said first named valve, and a controllable connection between the upper side of said bell and a point of said conduit beyond said first named valve.

2. In a gas governing device, in combination with a gas conduit, conjoined valve beats interposed in said conduit to control the flow of gas through said conduit, a spindle common to said valve beats, a bell sustaining said spindle, means for isolating said bell from the pressure zone around said valve beats, a transmission element extending upwards rom said bell, a pivoted quadrant operatively connected with said transmission element, a lever .fixed to said quadrant, a curved track fixed to said lever and tiltable on rocking movement of said quadrant effected by endwise movement of said transmission element, a weighted trolley movable along said track when said track is tilted, and a controllable connection from a point of said conduit beyond said `valve beats to the interior of said bell.

3. In a gas governing device, in combination with a gas conduit, an automatic governor including a valve interposed in said conduit and a controlling element connected to said valve, a track horizontally pivoted between its ends, a weight movable on said track, and operative connections between.

said track and said controlling element whereby said track is tilted and said weight moved to increase or decrease the load on said controlling element as said valve moves further from or nearer to its closed posi-- `tion, a controllable connection from a point 2in said conduit beyond said valve to the under side of said controlling element, a 'differential governor in series with said au- ,tomatic goveror and comprising a second `Valve within said conduit anterior to said `first mentioned valve, a controlling element `connected to said second valve and open on its under side to a point of said conduit 'anterior to said second valve, and a controllable connection between the upper side of said second named controlling element and a point of said conduit beyond said first named valve. l

4. In a gas governing device, in combination with a gas conduit, an automatic governor includingv a valve interposed in said conduit and a controlling element connected to said valve, a rack connected to said controlling element, a curved track pivoted horizontally between its ends and operatively connected to said rack, a weighted member movable along said track when said track is tilted on its pivot on endwise movement of said rack, a controllable connection from a point of said conduit beyond said valve to the under side of said controlling element, a differential governor in series with said automatic governor and comprising a second valve within said conduit, anterior to said first mentioned valve, a controlling element connected to said second valve and open on its under side to a point of` aid conduit anterior to said second valve, aml a controllable connection between the upper side of said second named controlling element and a point of said conduit beyond said first named valve.

In testimony whereof we have signed our names to this specification.

JOHN FINDLATER SIMPSON. WILLIAM CARMICHAEL PEEBLES. 

